<?php

namespace wechat;

/**
 * 微信小程序支付类
 */
class WxPay
{
    protected $wx_key = 'OxTamUkf8tgFVwhOBbzCsduszC4fEMjL';//微信商户key
    public function Pay($openid,$fee,$body,$order_sn){
        $appid =        'wxa349b654d2ceb453';//如果是公众号 就是公众号的appid
        $mch_id =       '1512563601';
        $nonce_str =    $this->nonce_str();//随机字符串
        $notify_url =   'http://dingdan.hihaoge.me/api/order/notify';
        $out_trade_no = $order_sn;//商户订单号
        $spbill_create_ip = '101.132.164.18';
        $total_fee =    $fee*100;//因为充值金额最小是1 而且单位为分 如果是充值1元所以这里需要*100
        $trade_type = 'JSAPI';//交易类型 默认

        //这里是按照顺序的 因为下面的签名是按照顺序 排序错误 肯定出错
        $post['appid'] = $appid;
        $post['body'] = $body;
        $post['mch_id'] = $mch_id;
        $post['nonce_str'] = $nonce_str;//随机字符串
        $post['notify_url'] = $notify_url;
        $post['openid'] = $openid;
        $post['out_trade_no'] = $out_trade_no;
        $post['spbill_create_ip'] = $spbill_create_ip;//终端的ip
        $post['total_fee'] = $total_fee;//总金额 最低为一块钱 必须是整数
        $post['trade_type'] = $trade_type;
        $sign = $this->sign($post);//签名
        $post_xml = '<xml>
	           <appid>'.$appid.'</appid>
	           <body>'.$body.'</body>
	           <mch_id>'.$mch_id.'</mch_id>
	           <nonce_str>'.$nonce_str.'</nonce_str>
	           <notify_url>'.$notify_url.'</notify_url>
	           <openid>'.$openid.'</openid>
	           <out_trade_no>'.$out_trade_no.'</out_trade_no>
	           <spbill_create_ip>'.$spbill_create_ip.'</spbill_create_ip>
	           <total_fee>'.$total_fee.'</total_fee>
	           <trade_type>'.$trade_type.'</trade_type>
	           <sign>'.$sign.'</sign>
	        </xml> ';
        //统一接口prepay_id
        $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
        $xml = $this->http_request($url,$post_xml);
        $array = $this->xml($xml);//全要大写
        file_put_contents('./logs/wxpay.php',date('Ymd H:i:s',time()) . '微信支付下单结果' . json_encode($array) . PHP_EOL,FILE_APPEND);

        if($array['RETURN_CODE'] == 'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS'){
            $time = time();
            $tmp='';//临时数组用于签名
            $tmp['appId'] = $appid;
            $tmp['nonceStr'] = $nonce_str;
            $tmp['package'] = 'prepay_id='.$array['PREPAY_ID'];
            $tmp['signType'] = 'MD5';
            $tmp['timeStamp'] = "$time";

            $data['state'] = 1;
            $data['timeStamp'] = "$time";//时间戳
            $data['nonceStr'] = $nonce_str;//随机字符串
            $data['signType'] = 'MD5';//签名算法，暂支持 MD5
            $data['package'] = 'prepay_id='.$array['PREPAY_ID'];//统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*
            $data['paySign'] = $this->sign($tmp);//签名,具体签名方案参见微信公众号支付帮助文档;
            $data['out_trade_no'] = $out_trade_no;

        }else{
            $data['state'] = 0;
            $data['text'] = "错误";
            $data['RETURN_CODE'] = $array['RETURN_CODE'];
            $data['RETURN_MSG'] = $array['RETURN_MSG'];
        }
        // echo json_encode($data);
        file_put_contents('./logs/wxpay.php',date('Ymd H:i:s',time()) . json_encode($array) . PHP_EOL,FILE_APPEND);

        return $data;
    }

    //随机32位字符串
    private function nonce_str(){
        $result = '';
        $str = 'QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz';
        for ($i=0;$i<32;$i++){
            $result .= $str[rand(0,48)];
        }
        return $result;
    }

    //签名 $data要先排好顺序
    private function sign($data){
        $stringA = '';
        foreach ($data as $key=>$value){
            if(!$value) continue;
            if($stringA) $stringA .= '&'.$key."=".$value;
            else $stringA = $key."=".$value;
        }
        $wx_key = $this->wx_key;//申请支付后有给予一个商户账号和密码，登陆后自己设置key
        $stringSignTemp = $stringA.'&key='.$wx_key;//申请支付后有给予一个商户账号和密码，登陆后自己设置key
        return strtoupper(md5($stringSignTemp));
    }

    //curl请求啊
    function http_request($url,$data = null,$headers=array())
    {
        $curl = curl_init();
        if( count($headers) >= 1 ){
            curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
        }
        curl_setopt($curl, CURLOPT_URL, $url);

        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);

        if (!empty($data)){
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }

    //获取xml
    private function xml($xml){
        $p = xml_parser_create();
        xml_parse_into_struct($p, $xml, $vals, $index);
        xml_parser_free($p);
        $data = "";
        foreach ($index as $key=>$value) {
            if($key == 'xml' || $key == 'XML') continue;
            $tag = $vals[$value[0]]['tag'];
            $value = $vals[$value[0]]['value'];
            $data[$tag] = $value;
        }
        return $data;
    }
}